public class Test {
        private static Object locker1=new Object();
        private static Object locker2=new Object();

        public static void main(String[] args) {
            Thread t1=new Thread(()->{
                System.out.print("A");

                //未防止t1提前执行了notify，然后t2再执行了wait，会使t2的wait无法唤醒,只需进行一个sleep即可
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                synchronized(locker1){
                    locker1.notify();
                }
            });

            Thread t2=new Thread(()->{
                synchronized(locker1){
                    try{
                        locker1.wait();
                    }catch (InterruptedException e){
                        throw new RuntimeException(e);
                    }
                }
                System.out.print("B");

                synchronized (locker2){
                    locker2.notify();
                }
            });

            Thread t3=new Thread(()->{
                synchronized(locker2){
                    try {
                        locker2.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                System.out.println("C");
            });

            t1.start();
            t2.start();
            t3.start();
            
        }
}
